InChI=1S/C18H18O11/c19-9(3-1-2-8-4-5-10-11(6-8)27-7-26-10)17(25)29-18-14(22)12(20)13(21)15(28-18)16(23)24/h1-6,12-15,18-22H,7H2,(H,23,24)/b2-1-,9-3-